"Marty, you're not thinking 4th dimensionally!"

In this case the missing 4th dimension is edge data. True spatial computing needs to utilise the actual space around us. There should be no display because everything is the interface. By using everyday spaces around us and pulling in edge data everything becomes contextually aware.

Apple cheats in this regard, providing the user with a realtime 1:1 recreation of their surroundings. Its still VR, albeit an exact copy of IRL. This is incredibly impressive tech for its day but the excitement comes knowing this is as bad as it will ever be.